92 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



IHirundo'] albilinea Sclater and Salvin, Nom. Av. Neotr., 1873, 14. 



Tachycineta albilinea Lawrence, Mem. Boat. Soc. N. H., ii, 1874, 271 (Mazatlan, 

 resident; habits).— Salvin and Godman, Biol. Centr.-Am., Aves, i, 1883, 

 235 (Belize R. and coast cays, British Honduras; Peten, Yaxha, Rio Dulce, 

 Huamuchal, Chiapam, and San Jose, Guatemala; La Union, Salvador; 

 Amapala, Honduras; Corinto, Nicaragua; Matachin, Isthmus Panama, etc. ). — 

 Nutting, Proc. U. S. Nat. Mus., vi, 1884, 392 (Ometepe, Nicaragua). — 

 Sharpe, Cat. Birds Brit. Mus. , x, 1885, 115, 631 ( Vera Cruz, Mexico; Belize R., 

 British Honduras; Chiapam, Guatemala; Punta Arenas, Costa Rica; Panama 

 and Lion Hill, Panama, R. R. ; Chepen,>Peru). — Zeledon, Anal. Mus. Nac. 

 Costa Rica, i, 1887, 107 (Costa Rica).— Richmond, Proc. U. S. Nat. Mus., 

 xvi, 1893, 486 (Rio Frio, Costa Rica). — Sharpe and Wyatt, Mon. Hirund., 

 1894, 149, 188, pi. 22.— Bangs, Auk, xviii, 1901, 368 (David, Chiriqui). 



T[achycineta'] albilinea Ridgway, Man. N. Am. Birds, 1887, 462. 



\_Hirundo] albilineata Gray, Hand-list, i, 1869, 71, no. 845. 



Petrochelidon littorea Salvin, Proc. Zool. Soc. Lond., 1863, 189 (Belize River, 

 British Honduras; coll. Salvin and Godman ).« 



Hirundo Icucopygia (not H. leucopyga Meyen) Taczanowski, '' Proc. Zool. Soc. 

 Lond., 1880, 192 (Chepen, n. Peru, alt. 400 ft.); Orn. du Perou, i, 1884, 240. 



Genus TACHYCINETA Cabanis. 



Tachycineta'' Cabanis, Mus. Hein., i, 1850, 48. (Type, Hirundo thalassina 

 Swainson.) 



Small or medium-sized Hirundinidge (wing, 99-125 mm.) with narrow, 

 operculate nostrils opening laterally; frontal feathers not reaching to 

 anterior end of nostrils; tail about two-fifths as long as wing, forked 

 for about one-fifth its length; lateral toes, relatively short and weak, 

 their claws falling decidedly short of base of middle claw; upper parts 

 soft (not glossy) green, bronze, and violet, under parts and sides of 

 head white. 



Bill small, weak and much depressed, its width at frontal anti^e about 

 equal to length of exposed culmen, the latter nearly equal to distance 

 from nostril to eye; culmen nearly straight for basal half, then grad- 

 ually decurved, the tip of the maxilla narrowly and distinctly unci- 

 nate; maxillary tomium straight, its subterminal notch distinct. Nos- 

 tril opening laterally, longitudinal, narrowly ovate-elliptical, over- 

 hung by a broad membraneous operculum, the feathering of frontal 

 antiffi extending forward about as far as middle of nostrils. Kictal 

 bristles distinct, extending decidedly beyond edge of maxillary tomium. 

 Tail much less than half as long as wing, emarginate, the depth of 

 emargination about one- fifth its total length, the lateral rectrices broad 

 to near end, where the inner web is rather abruptly contracted, the 

 tip obtusely pointed. Tarsus longer than middle toe (without claw), 

 the upper portion feathered in front and on sides, the feathering on 



« According to Sharpe, Cat. Birds Brit. Mus., x, 1885, 631. 

 & Described as a new species, from Stolzmann's manuscript. 

 c "Von raxvKivT/ro'; sich schnell bewegend." 



